At this point, the ribbon and the context menu are not localized out of the box and the users need to change the strings manually.

Currently the following text filters are not supported in the model, filtering popup and Custom Filter dialog:
- begins with
- does not begin with
- ends with
- does not end with
- contains
- does not contain.

All of these are supported in MS Excel.

Check how the performance can be improved in this scenario. The StyleGallery is taking much time to load, the GetUsedCellRange method is called multiple times.

If the RadSpreadsheet is declared as a child content in the RadBusyIndicator, there isn't any tab selected as active in the SheetSelector.

Workaround: Declare the busy indicator after the RadSpreadsheet not as its child.

For example, instead of:

<telerik:RadBusyIndicator>
    <telerik:RadSpreadsheet x:Name="radSpreadsheet" />
</telerik:RadBusyIndicator>

Do:

<Grid>
    <telerik:RadSpreadsheet x:Name="radSpreadsheet" />
    <telerik:RadBusyIndicator />
</Grid>

Add support for import and export of Excel Template files (XLTS) file format.

The BitmapImage class throws the exception. We could show some kind of no-image-placeholder instead of throwing exception, or skip the image.

Telerik Reporting creates such files.

Attached is a sample project demonstrating how to customize the Open command descriptor to remove .emf images just after importing the document.

Available in R3 2018 Official Release Version.

The overlapping of SelectionFill and SelectionStroke geometries may be seen in the attached screenshot. This scenario may be reproduced with the following RadSpreadsheet instance:

<telerik:RadSpreadsheet SelectionStroke="Red" SelectionStrokeThickness="10" FillHandleSelectionStroke="Green" SelectionFill="#550000FF" />

The default set of WPF UI controls measured in infinity results in the minimal size of the control. RadSpreadsheet should behave the same. This will help users to find out what is happening while debugging.

If a workbook contains a worksheet with RowHeight bigger than 600px (SpreadsheetDefaultValues.MaxRowHeight), an exception is thrown while trying to import such a document. 

Enable copy-paste of content from and to Excel, preserving all of the applied formatting, styles and images.

Currently, RadSpreadsheet supports only CSV for exchanging clipboard data with Excel, and all formatting (including number formats and data validation) is lost.

If you set "[h]:mm" as a custom format to a cell which has time set to it the calculated value in the cell is wrong for the minutes. The minutes part is interpreted as months.

The number format [hh]:mm causes ArgumentException on import.

Number formats like "[$-1010409]General" containing locale code and General keyword are not parsed correctly which results in interpreting them as number formats which have to replace the positive numbers with "General".

Available in R1 2017 SP

The visualization and scrolling of documents containing many merged cells (e.g. 1000) is very slow. The control becomes almost unusable when the number increases.

Grouping is a mechanism to organize data in sections, in order to be able to show and hide the relevant chunks.

Each row or column which is part of a group is assigned an outline level, which determines the level of grouping and from there which rows or columns it is grouped with. 

Clicking the Find All button resizes the dialog to a smaller size and the buttons on the bottom are not visible. Closing the dialog and opening it again opens it with very large size.
No workaround at the moment.

When using the OpenFile command to open a document, you should be able to obtain the Name of the workbook in the WorkbookChanged event handler. 

DataValidationRule is persisted after pasting a cell value which is copied from a cell without DataValidationRule applied. 

For example: Cell A1 has data validation rule applied. The cell A2 doesn't have. The value from cell A2 is copied to cell A1. The result is that cell A1 still has data validation, but it shouldn't.